JPS63100969A - Dispenser gun - Google Patents

Abstract

A dispenser gun having a rod-advancing mechanism of the tilting gripper kind employs a hardened steel rod (4) of circular cross-section and a sintered metal gripper (12) having a circular hole (21) through which the rod slides. The gripper has, on at least one side, an indentation (25,28; 31,32) having a generally arcuate base and running into the hole (21). The gripper when tilted grips the rod firmly without marking the rod.

Description

TECHNICAL FIELD This invention relates to dispenser guns for dispensing thick liquids or pastes, such as viscous materials such as resinous caulks.

[Background Art] This type of gun is arranged to reciprocate in the longitudinal direction of the rod axis, and the rod grip position in the forward stroke of the reciprocating movement of the gripper for advancing the rod and the rod grip position without moving the rod. It includes a one-way gripper adapted to be inclined with respect to the axis of the wood between a rod release position and a reciprocating stroke of the gripper to return the gripper. Dispensers of various constructions for viscous materials are known, one particular example of which is described in GB 1264311A.

It is. It describes a gun for extruding liquid or semi-liquid substances, comprising a body, a rod attached to it for axial movement over the body, and a rod attached to the body and adapted to move the rod in the manner described above. and a unidirectionally movable gripper arranged to advance the gripper.

Most guns of this type have a rod of circular cross-section, and the gripper has a circular aperture through which the rod passes completely freely. When the gripper is tilted relative to the gripping position, theoretically there will be only point contact at two places between the gripper and the rod, one on the grip at one point on the rod, and one on one side of the collar. , this point is located diametrically opposite the first point and axially spaced apart from the rod.

In practice, when in the rod gripping position, there is a proper engagement between the gripper and the rod to apply sufficient force from the gripper to the rod to force out the highly viscous material without the gripper slipping along the rod. It has been found that arranging the structure in such a way as to cause significant damage to the rod. These scratches prevent the smooth return movement necessary for the rod to slide freely through the gripper.

The invention described in British Patent No. 1264311A is
That is, although the use of a hexagonal rod and a diamond-shaped hole provides a line contact between the end of the hole and the surface of the rod, under high loads, such a configuration also readily causes rod scratches. .

A further effect of the high loads on the conventional guns described above is that the ends of the hole through which the rod passes and engages the rod are deformed. This further causes the gripper to tilt excessively before the gripping engagement between the gripper and the rod is complete, so that the cutting action of the member (such as the trigger) that produces the tilting action is wasted. This results in less than a predetermined amount of material being dispensed on each forward stroke of the gripper.

Users of dispenser guns are demanding the application of increasingly higher forces to the material to be dispensed, which on the one hand increases the speed of dispensing, and on the other hand, many modern adhesives and sealants are inherently This is due to its extremely high viscosity. Previously, it was possible to increase the load only at the cost of damage to the rod and deformation of the gripper.

DISCLOSURE OF THE INVENTION According to the present invention, a gun for extruding liquid or semi-liquid substances includes a body, a parallel side gripper plate having parallel side holes of circular cross section, and a gripper plate of circular cross section that slides into engagement with the hole. The gripper plate is attached to the main body and arranged to reciprocate in the longitudinal direction of the rod axis, and the gripper plate has a reciprocating forward stroke for advancing the rod relative to the wood axis. The gripper plate is inclined between the rod grip position and the rod release position during the backward stroke of the reciprocating movement of the gripper plate to return the temporary grip without moving the rod, and one side of the gripper plate has a substantially arc-shaped base. having two arcuate parts connected to the hole;
One of them has a groove formed by the intersection of said hole and said one side of the gripper plate, and the other one has a groove formed by the intersection of the base of the groove and said hole.

According to another feature of the invention, a dispenser gun for dispensing liquid includes a body, a parallel-sided piston rod of circular cross-section mounted for reciprocation on the body, and a parallel-sided piston rod of circular cross-section through which the rod passes. a rod advancement mechanism having a gripper plate with parallel side holes, the mouth of the hole on one side of the gripper plate being bounded at least in part on its periphery by an elongated arc, the shape of which is similar to that of the gripper plate; When the rod is inclined, the long arc engages the rod over a considerable length. This comprises providing a parallel side gripper plate with a groove on one side thereof having a substantially arcuate base and communicating with said hole, one of which is made by the intersection of said hole with one side of the gripper plate;
The other is done by providing an edge in the hole on said one side of the gripper plate formed by two arcuate sections formed by the intersection of the base of the groove and said hole.

Preferably, there is a similar elongated arc on the opposite side of the gripper plate. That is, if the gripper plate is parallel-sided, the opposite side of the gripper plate will also have a similar groove at a position diametrically opposite to the first groove.

It has been found that such an arrangement allows very large forces to be transmitted between the gripper plate and the rod without the gripper plate slipping relative to the rod and without damaging the rod. This effect is caused by the edge of the gripper plate, which engages the rod over a considerable arc when the gripper plate is tilted only slightly.

It has been found that since the difference in diameter between the rod and the hole through which it passes can be very small, a suitable grip can be achieved with a very small inclination of the gripper plate relative to the rod. The rods were found to be largely or completely unharmed by the transmission of considerable forces. However, this condition can be further improved by making the rod of mild steel and hardening its thin surface layer, for example by passing the rod through an induction furnace and rapidly cooling it, for example in an oil bath.

One or both of the grooves formed therein may be parallel grooves on both sides that are continuous with the holes, or alternatively, they may be dome-shaped depressions that overlap the holes. Preferably, the width of the groove is approximately equal to the diameter of the hole.

The gripper plate is preferably made of metal by sintering, but may also be made by other methods, such as for example lost wax casting.

Embodiments Although the invention may be implemented in various ways, one dispenser device for viscous materials embodying the invention will be described below by way of example along with a deformed gripper. These will be explained with reference to the attached drawings.

The dispenser shown in the drawings, in particular in FIG. It has an operating mechanism 3 for advancing the robot. The operating mechanism has a body part 5 with an attached handle 6, which can be grasped by hand and to which a trigger-like member 7 is pivotally mounted. There is a stud 11 at the end of the trigger member 7 on the side opposite to the finger rest on the pivot 8 side. The piston rod 4 passes through with a gap. The upper end of the plate 12 rests against the shoulder 13 of the main part 5, and the plate 12 is pressed to the right in the drawing by a compression spring 14. The piston rod also passes through a second apertured plate 15 which is connected to the boss 1 on the body 5.
6 and is pressed to the right side in the drawing by a compression spring 17.

Although the operation of this type of mechanism is well known in the art, it will be briefly described.

When the trigger member 7 is squeezed by hand in the direction of the grip 6, the stud 11 moves around the engagement point of the contact portion 13Φ until the upper and lower ends of the hole in the plate 12 grip the upper and lower surfaces of the piston rod 4.
Tilt. Continuing the backward movement of the trigger member 7,
The plate 12 advances together with the piston rod to advance the piston within the barrel 1. During this forward movement of the piston rod 4, the rod is sliding through the plate 15;
5 is slightly inclined about the stud 16 to allow free movement of the rod 4 through the aperture in the plate.

When the trigger member 7 is released, the spring 14 returns the plate 12 to the position shown in FIG. 1, and the plate 12 slides along the rod 4, which is prevented from moving in the opposite direction by the plate 15. , again assuming the position shown in FIG. 1 and grasping the rod 4. Spring 1
The return movement of the plate 12 under the action of 4 also causes the trigger member 7
Return to the position shown.

2, which shows the gripping member or plate 12 in detail.
Please refer to the figures and FIG.

The grip 12 is shown in detail in FIGS. 2-5, and
It consists of a roughly keyhole-shaped plank made of sintered metal and having in its wide part a cylindrical hole 21 passing from the rear surface 22 to the front surface 23, the axis of which is perpendicular to both sides. It is. On the narrow part of the front face 23 there is a boss 24 whose sole purpose is to distinguish the front face from the rear hem to enable the gripper to be assembled in a precise manner.

A shallow groove 25 is formed in the rear surface 22, and the width of the groove is equal to that of the hole 2.
1, and its base is an arc.

The groove starts at the closed end 26 and continues towards the hole 21, forming a non-circular arc 27 intersection between the groove 25 and the hole 21. A groove 28 having the same shape is formed on the front surface 23, but this groove is similar to the groove 25 on the rear surface that continues to the top of the hole 21.
In contrast, it flows into the bottom of the hole 21.

When the gripper 12 is attached to the rod 4 in a sliding engagement with it (the term sliding is not used here in the technically defined sense but in the general everyday sense of a completely intimate but free-moving engagement) ), Bin 11
The force exerted on the lower part of the gripper by the gripper tilts the gripper very slightly, causing the curved edge 27 at the intersection above the rod 4 between the groove 25 and the hole 21 and between the groove 28 and the hole 21 on the front side of the gripper. The intersections below the rod engage the rod, and these sharp edges
Grasp it in an arc shape instead of a dot shape. Therefore, the rod 4 is gripped tightly and a considerable force can be applied to the trigger member, through the pin 11 and the plate 12 and thus to the piston in the barrel 1. Pressure can be increased on the material and extruded through the nozzle 2.

In the variant shown in FIG. 6, grooves 25 and 28 are partially replaced by spherical depressions 31 and 32.

Test results have shown that a force of at least 1000 kg can be applied to the material to be dispensed in a gun constructed as shown in Figures 1 to 5, and that such a load can be applied without appreciable damage to the rod. It has also been found that the gripper can be applied repeatedly without noticeable wear. Investigations have shown that as much as 170 degrees of contact between the rod and each engagement edge creates a total of 340 degrees of contact. Other tests on grippers without grooves found that little or no gripping occurred and slipping on the gripper rods occurred.

[Brief explanation of the drawing]

Figure 1 is a side view of the dispenser, Figure 2 is a rear view of the gripper of the dispenser shown in Figure 1, Figure 3 is a side view of the gripper, Figure 4 is a front view of the gripper, and Figure 5. is a sectional view taken along the plane ■--■ in FIG. 2, and FIG. 6 is a view similar to FIG. 2 regarding the deformed structure of the gripper. In the figure, 4 is a rod, 5 is a main body, 12 is a gripper plate, 21
25 and 28 are holes, 25 and 28 are grooves, and 27 are edges, respectively. Agent Patent Attorney Muneharu Sasaki/-tc, 2. Fte, 3.
Hmm, 48. Procedural amendment written spontaneously) 1. Indication of the case Patent application No. 62-228685 2. Name of the invention Dispenser gun 3. Person making the amendment Relationship to the case 1i Applicant address Parkshire, UK 13
2 Q.R., Newbury, Shaw, Turnbike Road, Turnbike, Industrial Nistate (no address) Name: B.C.C. Cox (Newbury) Limited 4; Agent address: 8, Toranomon Go, Minato-ku, Tokyo No. 6 Amitavir 1) (1), (2>, and (3) will be corrected as shown in the attached sheet. Regarding 2> (4), Figures 1 to 6 will be corrected as shown in the attached sheet.

Claims (10)

[Claims] (1) A main body, a parallel-sided gripper plate having a parallel-sided hole with a circular cross-section, and a rod with a circular cross-section that slides into the hole, and the gripper plate is attached to the main body and a rod gripping position during a reciprocating forward stroke of the gripper plate configured to reciprocate longitudinally relative to an axis of a rod to advance the rod and return the gripper plate without moving the rod; The gripper plate is configured to be inclined with respect to the axis of the rod between the rod release position in the backward stroke of the reciprocating movement of the gripper plate, and one side of the gripper plate has a substantially arcuate base and the hole. a continuous groove forming an edge in the hole on the one side of the gripper plate formed by two arcuate portions, one of the two arcuate portions forming an edge at the intersection of the hole and the one side of the gripper plate; gun for the extrusion of liquid or semi-liquid substances, the other being formed by the intersection of the base of said groove and said hole. (2) a similar groove is provided on the opposite side of the gripper plate;
A gun as claimed in claim 1, located diametrically opposite to the first groove. (3) The gun according to claim 2, wherein the rod is made of mild steel with a hardened surface layer. (4) The mechanism according to claim 3, wherein the gripper plate is made of sintered metal. (5) A gripper plate having a main body, a piston rod having a circular cross section and a parallel side portion reciprocatingly attached to the main body, and a gripper plate having a parallel side hole having a circular cross section through which the rod passes. The mouth of the hole on one side of the gripper plate is bounded at least part of its periphery by an elliptical arc, and the shape is such that when the gripper plate is tilted, the ellipse has a length corresponding to the rod. Dispenser guns for extruding viscous materials, such as engaging across. (6) the gripper plate has parallel sides, and one side of the gripper plate has a groove having a generally arcuate base that connects to the hole and creates an edge in the hole on the one side of the gripper plate;
This forms two arcuate sections, one of which is formed by the intersection of the hole with one side of the gripper plate and the other by the intersection of the base of the groove with the hole, the patent A dispenser gun according to claim 5. 7. The dispenser gun of claim 6, wherein a similar arc is present on the opposite side of the gripper plate. 8. The dispenser gun of claim 7, wherein a like arc is diametrically opposed to the first groove as a like groove on an opposite side of the gripper plate. (9) The dispenser gun according to claim 8, wherein the rod is made of mild steel with a hardened surface layer. (10) The dispenser gun according to claim 9, wherein the gripper plate is made of sintered metal.